How high can I go?

Most track­ers can mon­i­tor hor­i­zon­tal dis­tance trav­elled, but ver­ti­cal is a bit trick­ier. High-end watches such as Garmin’s Fenix 3 (from £380) have things like an al­time­ter and barom­e­ter to track ver­ti­cal move­ment in climb­ing, moun­tain bik­ing, or skiing, say.